{"id":580,"date":"2011-10-31T00:18:32","date_gmt":"2011-10-31T00:18:32","guid":{"rendered":"http:\/\/perezmedia.net\/beltofvenus\/2011\/10\/31\/c2009_p1_garrad\/"},"modified":"2023-12-25T04:45:01","modified_gmt":"2023-12-25T04:45:01","slug":"c2009_p1_garrad","status":"publish","type":"post","link":"https:\/\/perezmedia.net\/beltofvenus\/2011\/10\/31\/c2009_p1_garrad\/","title":{"rendered":"C\/2009 P1 (Garradd) &#8211; OCT 31-NOV 1, 2011"},"content":{"rendered":"<div class=\"imageblock\"><a href=\"http:\/\/www.perezmedia.net\/beltofvenus\/archives\/images\/2011\/img2011103001_C2009P1lg.jpg\"><img decoding=\"async\" src=\"http:\/\/www.perezmedia.net\/beltofvenus\/archives\/images\/2011\/img2011103001_C2009P1A.jpg\" alt=\"Sketch of comet C\/2009 P1 (Garradd)\" name=\"img2011103001\" \/><\/a><br \/>\n<script type=\"text\/javascript\"><br \/>\n<!--\nsetrollover(\"http:\/\/www.perezmedia.net\/beltofvenus\/archives\/images\/2011\/img2011103001_C2009P1B.jpg\");\n\/\/--><br \/>\n<\/script><\/p>\n<p class=\"caption\">Sketch of comet C\/2009 P1 (Garradd)<\/p>\n<p><i>Move mouse over sketch above to view labels.<br \/>\nClick image for larger version.<\/i><\/p>\n<\/div>\n<p><b>Observation Notes:<\/b><\/p>\n<p>I enjoyed a very nice view of C\/2009 P1 (Garradd) tonight. It&#8217;s been too long since I&#8217;ve gotten out for a recreational observation. The coma was moderately condensed with distinct elongation to the southeast. Further scrutiny revealed a prominent tail about 10 arc seconds in length pointed to the southeast at a PA of 115\u00b0. The south edge of this tail had a more abrupt spine while the north edge was softer. At a northeast PA 67\u00b0, a shorter, more delicate tail drifted about 5 arc seconds from the central condensation. Overall, there was an impression of a diffuse hood draped across the northwest side of the coma.<\/p>\n<p>At times, I thought I detected the slightest hint of green in the coma, but I wasn&#8217;t certain enough to include it in the sketch. The warmly colored, ninth magnitude glow of TYC1559-1174-1 decorated the north edge of the view. I looked for evidence of the comet&#8217;s motion 90 minutes later, and there appeared to be some slight drift to the northwest. However, I hadn&#8217;t plotted the star field with enough density close to the coma to estimate the apparently slow motion with enough accuracy.<\/p>\n<p><b>OCT 31, 2011 UPDATE:<\/b> I re-observed the comet the following night (NOV 1, 2011, 0330 UT) and noted motion of about 8 arc minutes to the west-northwest at a PA of about 287\u00b0.<\/p>\n<table class=\"objectdata\">\n<tbody>\n<tr>\n<td><b>Subject<\/b><\/td>\n<td class=\"subject\">C\/2009 P1 (Garradd)<\/td>\n<\/tr>\n<tr>\n<td><b>Classification<\/b><\/td>\n<td>Comet<\/td>\n<\/tr>\n<tr>\n<td><b>Position*<\/b><\/td>\n<td>Hercules: [RA: 17 37 31.2 \/ Dec: 18 44 35.5]<\/td>\n<\/tr>\n<tr>\n<td><b>Size<\/b><\/td>\n<td>Coma: 5 arc minute diameter<br \/>\nDegree of Condensation: 6<br \/>\nDust tail: 10 arc minute length at 115\u00b0 PA<br \/>\nIon tail: 5 arc minute length at 67\u00b0 PA<\/td>\n<\/tr>\n<tr>\n<td><b>Brightness*<\/b><\/td>\n<td>6.5 vMag<\/td>\n<\/tr>\n<tr>\n<td><b>Date\/Time<\/b><\/td>\n<td>OCT 30, 2011, 7:00 PM MST<br \/>\n(OCT 31, 2011, 0200 UT)<\/td>\n<\/tr>\n<tr>\n<td><b>Observing Loc.<\/b><\/td>\n<td>Flagstaff, Arizona, USA &#8211; Home<\/td>\n<\/tr>\n<tr>\n<td><b>Instrument<\/b><\/td>\n<td>SkyQuest XT8 (8 inch f\/5.9 Dobsonian)<\/td>\n<\/tr>\n<tr>\n<td><b>Eyepieces\/Mag.<\/b><\/td>\n<td>Pentax XW10 (120X)<\/td>\n<\/tr>\n<tr>\n<td><b>Conditions<\/b><\/td>\n<td>Clear, calm, 1st quarter moon<\/td>\n<\/tr>\n<tr>\n<td><b>Seeing<\/b><\/td>\n<td>5\/10 Pickering<\/td>\n<\/tr>\n<tr>\n<td><b>Transparency<\/b><\/td>\n<td>SQM: 20.0<\/td>\n<\/tr>\n<tr>\n<td><b>*Sources<\/b><\/td>\n<td>Starry Night Pro Plus 5.8; <a href=\"http:\/\/aerith.net\/comet\/catalog\/2009P1\/2009P1.html\" target=\"_blank\" rel=\"noopener\">Aerith.net<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"<p>C\/2009 P1 (Garradd)<\/p>\n","protected":false},"author":1,"featured_media":1101,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[10,45],"tags":[],"class_list":["post-580","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-comet","category-sg-comet"],"jetpack_featured_media_url":"https:\/\/perezmedia.net\/beltofvenus\/wp-content\/uploads\/2011\/10\/img2011103001_C2009P1A-e1703479493209.jpg","jetpack-related-posts":[{"id":311,"url":"https:\/\/perezmedia.net\/beltofvenus\/2007\/01\/08\/c2006_p1_mcnaug\/","url_meta":{"origin":580,"position":0},"title":"C\/2006 P1 (McNaught) &#8211; 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